notam a,b,c,d masurile unghiurilor patrulaterului
a+b+c+d=360°
b) {a,b,c,d} i.p. {1,2,3,6}
1·a=2·b=3·c=6·d=k
a=k; b=k/2; c=k/3; d=k/6
k+k/2+k/3+k/6=360° |·6
6k+3k+2k+k=2160°
12k=2160°
k=2160°:12
k=180°
a=k=180°
b=k/2=180°/2
b=90°
c=k/3=180°/3
c=60°
d=k/6=180°/6
d=30°
R: a=180°; b=90°; c=60°; d=30°
